3^4 AUSTRALIAN COHDULIIN^, 



the existence of one or more coordinate groups besides these, 

 necessitating further subdivision : — 



GuGUP i. Larva with large head and thorax, very long or 

 fairly long legs, broadly oval abdomen; labium of Libelhdineiorm,' 

 with no deep incisions of the outer edge of the lateral lobes, but 

 with shallow crenations generally armed with sets of small spines; 

 lateral lobes often with small warts or dots scattered over the 

 surface; numerous mental and lateral setse. 



Imago with robust head and thorax, long legs, usually more 

 or less corduliform abdomen. Wmg-venatwn characterised by 

 large triangles, and forewing-subtriangle, usually all crossed; 

 complete or practically complete recession of hindwing-triangle 

 to arculus; large triangle and forewing-subtriangle; anal loop 

 considerably elongated, with a more or less definite longitudinal 

 bisector Eucordulina. 



Group ii. Larva with smaller head and thorax, short or 

 very short legs, large oval abdomen, very flat beneath; labium 

 with deep irregular incisions, armed with small spines, but with- 

 out warts or spots; not many mental or lateral setie. 



I m a g o with smaller head, small or moderate thorax, short or 

 very short legs, and usually a slender cylindrical abdomen. 

 Wing-venation characterised by incomplete recession of hindwing- 

 triangle; triangles and subtriangle free, and smaller than in 

 Group i.; anal loop short or fairly short; with no longitudinal 

 bisector Idocordulin,a. 



In the Eucordulina, I include the following genera — Hemi- 

 cordidia, Procordulia, Stmiatocldora, Pa acoidnlia, Dorocordulia, 

 Cordulia, llelocordnlia, Epicordulia, Tttrayorteuria, Epitheca, 

 Neurocordnlia, Aeschriosoma, Libelhdosoma, Pentathemis, Platy- 

 cordulia; also Oxyyastra and Ilesperocordidia, which are the con- 

 necting links with the Idocordidina, but appear to me to deserve 

 inclusion rather in the Eucordulina; and finally, C ordideplnja, 

 for reasons that will be given in a separate paper on that genus. 



In the IdocordvUna I include — JSyncordulia, Lathrocordulia, 

 Neocordulia, Austrocordulia, JVesocordulla, Gomphomacrotnia (G. 

 paradoxa Br., but not G. volxemi Selys), PseudocorduUa, Ann- 



